Ignore files created by run_unit_tests.sh
Ignore files created by run_unit_tests.sh

It mainly ignores functest_venv and files created by nose and
coverage.

Change-Id: If2695716c35b25b84774cf00c298229d803c9c21
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

opnfv/functest,mywulin/functest,mywulin/functest,opnfv/functest